Device for describing ovals and circles.



C. A. CLOGSTON & F. KONRAD/ DEVICE FOR DESCRIBING OVALS AND CIRCLES.APPLICATION FILED JUNE 22. 1915.

1 1 88,900 Patented June 27, 1916.

2 SHEETS-SHEET I.

C. A. CLOGSTON & F. KONRAD DEVICE FOR DESCRIBING OVALS ANDECIRCLES.APPLICATION FILED JUNE 22. 1915.

1,1 88,900. Patented June 27, 1916.

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CARL A. CLOGSTON AND FERDINAND KONRAD, OF PORTLAND, OREGON.

DEVICE FOR DESCRIBING OVALS AND CIRCLES.

Specification of Letters Patent.

Patented June 27, 1916.

Application filed June 22, 1915. Serial No. 35,578.

To all @uhom it may concern:

Be it known that we, CARL A. CLoesToN 1 and FERDINAND KONRAD, citizensof the United States, residing at Portland, in the county of Multnomahand State of Oregon, have invented certain new and useful Improvementsin Devices for Describing Ovals and Circles, of which the following is aspecification.

This invention relates to an improved instrument for forming circles andovals and the principal object of the invention is to provide a devicewhich can be releasably connected with the pencil and which is providedwith an improved device for holding a string so that the string may belet out the desired amount and then releasably held in the adjustedposition.

Another object of the invention is to so construct the device as topermit the outer sleeve forming part of the same to rotate and thuscause the circle or oval to be perfcctly formed.

Another object of the invention is to provide a device which will bevery simple in construction and which can be cheaply produced.

This invention is illustrated in the accompanying drawings, whereinFigure 1 is a perspective view showing the device in operation. Fig. 2is a perspective view showing the device in operation but in a differentposition from that shown in Fig. 1. Fig. 8 is an enlarged view showingthe pencil in elevation and the attachment in longitudinal section. Fig.4 is a perspective view of the inner sleeve forming the body portion ofthe device. Fig. 5 is a perspective view of the outer sleeve which isrotatably mounted upon the inner sleeve. Fig. 6 is a perspective view ofthe frame which is connected with the outer sleeve and carries theroller. Fig. 7 is a perspective view of the sleeve which tends toprevent the roller from rotating. Fig. 8 is a perspective view of theroller. Fig. 9 is a perspective view of the collar which clamps theinner sleeve or body portion to the pencil.

The inner sleeve or body portion 10 of this device fits upon the pencil11 and is provided with a longitudinally extending slot 12 leading fromits upper edge thus providing jaws each of which is provided with astamped out portion forming a cam 13. The collar 14 is slidably mountedupon the inner sleeve above the abutment head 15 and when moved upwardlywill compress thej aws and tightly hold the sleeve 10 in place with thepencil extending beyond the lower end of the sleeve the desired amount.

The outer sleeve 16 is rotatably mounted upon the inner sleeve betweenthe abutment 15 and the lower abutment flange 17 and is therebypermitted to rotate when the instrument is in use, so that the pencilwill re main outside the loop of the line when in use. To this sleeve 16there is secured the frame or housing 18, the securing screw 20 of whichpasses through the opening 19 and has its inner end screwed into thethreaded opening 21 of the sleeve. Therefore the housing will beremovably secured by the screw which also serves as an axle for thespool or drum 22. This spool or drum 22 is rotatably mounted upon theaxle 20 within the housing or frame and has its heads provided withteeth as shown in Fig. 8 so that the spool may be engaged by theresilient tooth 23 of latch 24 and thus prevented from being rotated bydrawing upon the line or cord 25 wound upon the spool. In other words ifit is desired to unwind the line or cord 25 it is necessary to grasp theheads of the spool with the fingers and rotate the spool while removingthe line. This line 25 when put in place is doubled and has its endsconnected with the spool and then wound thereon so that when unwindingthe line the looped end shown in Figs. 1 and 2 will be provided. Thislooped end passes through the'opening 26 in the arm 27 of the frame andalso passes through the openings 28 so that when the device is not inuse, the extent to which the line can be wound upon the drum will belimited and thus the line left where it can be easily reached whendesired. It will thus be seen that this line is so put in place as topermit of it being readily engaged when desired.

In the operation of this device the push pins 29 will be first put inplace upon the papers whereon it is desired to draw the oval and theline 25 will then be drawn out the desired distance and placed about thepins as shown in Figs. 1 and 2. The pencil point is now brought to bearupon the paper and the oval can be easily drawn by simply moving thepencil across the paper. If it is desired to form a circle only one ofthe push pins 29 will be used so that the pencil will be the samedistance from the pin during the entire marking operation.

noted that with this device the size of the circle or oval can beregulated and either a small or a large oval formed. It should befurther noted that the proportions of the oval can be varied by varyingthe positions of the push pins and the length of the string.

Whatis claimed is 1. A- drafting instrument comprising a body portion, asleeve rotatably mounted upon said body portion, a housing carried bysaid sleeve and provided with an arm extending beneath the lower end ofsaid body portion; and having its lower end portion provided withanupper opening and with a pair of lower openings, a drum rotatablymounted in said housing, means engaging said drum for releasably holdingthe same in a set position, and a line having its end passing throughthe lower openings of said arm and being then passed through the upperopening and Wound upon said drum.

2. A drafting instrument comprising a body portion, a sleeve rotatablymounted upon said body'portion, a housing carried by 1 said sleeve, adrumrotatably mounted in said housing, and a line having its endsconnected with and wound upon said drum.

3. A drafting implement comprising a body portion, a sleeve rotatablymounted v\ i v thereon, a drum rotatably connected with said sleeve, alinehaving its end portions wound upon said drum to permit the line tobe Withdrawn from the drum in the form of a loop, and guiding means forconnecting said line with a surface to have an oval mark thereon. V

4. A drafting implement comprising a body portion, a sleeve carried bysaid body portion, a housing, carried by said sleeve, a drum rotatablymounted in said housing, a

latch formedof a strip of resilient material connected with said housingand having its free end portion engaging said drum to re-.

leasably hold the drum in a set position, and a linewound upon said drum5. A drafting implement comprising a body portion, a sleeve rotatablymounted thereon, a drum rotatably connected with said sleeve, and, aline Wound upon said drum. V V

6. A drafting implement comprising a body portion, a sleeve rotatablymounted upon said body portion, a drum'rotatably 1;

connectedwith said sleeve, and a line doubled and having its'free endswound upon said drum. g

In testimony whereof we affix ourtures in presence of two witnesses.

- CARL A. CLOGSTON. r

, vFERDINAND KONRAD. Witnesses:

JoHN S. GERRY, IMANU'EL' B. PALACIOS; I

flopiel of this patent may he obtained for 11V: cents each, hyaddressing the Commissioner or ratenb Washington, D. 0.

signa-

